I did speedbooking on the last days before the nerf, afterwards I started out doing HM books. I stumbled across that today, so I take it it's still possible? And I suppose it's also faster than doing HM books? I don't mind playing through HM EOTN but it would be useful after doing it for the 10th time >.>
And I suppose it's also faster than doing HM books?
It's not. It's easier but takes longer. But if you learn how to do the eotn missions efficiently, filling (or mostly filling) the books in HM is more efficient than speedbooking, particularly if you grab zaishen missions along the way that reward generously toward your titles.
However, both of these are slow compared to vanquishing. It's not even close. Also be aware of the Asuran quest "Path to Revelations," which will allow you to quickly raise Norn points as long as you don't cash in the reward.